Publikationsdatum:
2019
Beschreibung:
Abstract
Observations from 1980 to 2013 of 20 aerosol constituents, ozone and mercury at Alert, Canada (82.50° N, 62.35° W) were analyzed for trends and dominant factors of the Arctic haze during winter and spring. Trends reflect changing emissions in Eurasia, the main source region for surface pollution in the high Arctic. SO42‐, H+, NH4+, K+, Cu, Ni, Pb, Zn, non‐soil V, non‐soil Mn, and equivalent black carbon (EBC) decreased between 23 and 80% as emissions declined rapidly in northern Eurasia during the early 1990's. NO3‐ increased by 20% as aerosol acidity declined. Metals were linked to emissions from smelting and fossil fuel combustion. In winter, ozone increased by 5% over 23 years, consistent with other observations and global modelling. Twelve PMF factors emerged for the dark period (Nov to Feb) and 13 for the light period (Mar to May). Eleven PMF factors are common to both dark and light, a twelfth factor was associated with sulfate in the dark and nitrate in the light, and the thirteenth (light period), was related to ozone and gaseous mercury depletion near Alert. IODINE and NITRATE factors, important for Arctic chemistry, changed with sunlight. In light, 50% of all NO3‐ was on the NITRATE factor while in dark, most was associated with MODIFIED SEA SALT and EBC. In the dark (light), 90% (28%) of iodine were found on the factor IODINE and 58% associated with SEA‐SALT and MODIFIED SEA‐SALT. These results help in understanding the role of atmospheric chemistry in weather and climate processes.
Print ISSN:
2169-897X
Digitale ISSN:
2169-8996
Thema:
Geologie und Paläontologie
,
Physik
